I have seen a file download past 100%. But that was because I started downloading the file from one person (which was obviously incomplete), and then resumed the download from someone with a different(larger) version of the same file. Went up to 250%+ I think.

I don't think it was corrupt though.

I havn't had problems with corrupt downloads from that though. However, I have had a few downloads corrupted when trying to resume a download. It only downloads a few bytes then says it is complete, when it actually isn't.

But this doesn't happen too often either.